feature: make the node's label "node.kubernetes.io/exclude-from-exter…

…nal-load-balancers" valuable

The label specifies that the node should not be considered as a target for external load-balancers which use nodes as a second hop.

Signed-off-by: cyclinder <qifeng.guo@daocloud.io>

internal/config/config.go

@@ -1137,6 +1137,11 @@ func selectedNodes(nodes []corev1.Node, selectors []metav1.LabelSelector) (map[s
 	res := make(map[string]bool)
 OUTER:
 	for _, node := range nodes {
+		_, ok := node.Labels[corev1.LabelNodeExcludeBalancers]
+		if ok {
+			continue
+		}
+
 		if len(labelSelectors) == 0 { // no selector mean all nodes are valid
 			res[node.Name] = true
 		}